tools: kwboot: Allow to mix positional arguments with option -b

Commit 9e6d71d2b55f ("tools: kwboot: Allow to use -b without image path as
the last getopt() option") broke usage of kwboot with following arguments:

  kwboot -t -B 115200 /dev/ttyUSB0 -b u-boot-spl.kwb

Fix parsing of option -b with optional argument again.

Fixes: 9e6d71d2b55f ("tools: kwboot: Allow to use -b without image path as the last getopt() option")
Signed-off-by: Pali Rohár <pali@kernel.org>
Reported-by: Tony Dinh <mibodhi@gmail.com>
Tested-by: Tony Dinh <mibodhi at gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>

diff --git a/tools/kwboot.c b/tools/kwboot.c
index 3b45e19..9f2dd2d 100644 (file)
--- a/tools/kwboot.c
+++ b/tools/kwboot.c
@@ -2073,7 +2073,8 @@ main(int argc, char **argv)
                        bootmsg = 1;
                        if (prev_optind == optind)
                                goto usage;
-                       if (optind < argc - 1 && argv[optind] && argv[optind][0] != '-')
+                       /* Option -b could have optional argument which specify image path */
+                       if (optind < argc && argv[optind] && argv[optind][0] != '-')
                                imgpath = argv[optind++];
                        break;
 
@@ -2128,10 +2129,19 @@ main(int argc, char **argv)
        if (!bootmsg && !term && !debugmsg && !imgpath)
                goto usage;
 
-       ttypath = argv[optind++];
-
-       if (optind != argc)
+       /*
+        * If there is no remaining argument but optional imgpath was parsed
+        * then it means that optional imgpath was eaten by getopt parser.
+        * Reassing imgpath to required ttypath argument.
+        */
+       if (optind == argc && imgpath) {
+               ttypath = imgpath;
+               imgpath = NULL;
+       } else if (optind + 1 == argc) {
+               ttypath = argv[optind];
+       } else {
                goto usage;
+       }
 
        /* boot and debug message use baudrate 115200 */
        if (((bootmsg && !imgpath) || debugmsg) && baudrate != 115200) {